:root {
  --bg: #f8f8f8;
  --primary: #008da6;
  --primary-light: #e0f3f6;
  --dark: #222631;
  --muted: #6a6f7c;
  --border: #e5e7eb;
  --radius: 18px;
  --shadow: 0 14px 26px rgba(25, 36, 58, 0.08);
  --max-width: 1100px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Nunito', 'PingFang TC', 'Heiti TC', 'Microsoft JhengHei', sans-serif;
  background: var(--bg);
  color: var(--dark);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

main {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 0 24px 72px;
}

.product {
  margin: 64px 0;
}

.product__grid {
  display: grid;
  gap: 28px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.product__card {
  display: flex;
  flex-direction: column;
  gap: 20px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.product__gallery {
  border-radius: calc(var(--radius) - 6px);
  overflow: hidden;
  background: #ffffff;
  border: 1px solid var(--border);
  aspect-ratio: 3 / 4;
  position: relative;
  cursor: grab;
  touch-action: pan-y;
}

.product__gallery img {
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 180ms ease;
  object-fit: cover;
  object-position: center;
}

.product__gallery img.is-active {
  opacity: 1;
}

.product__gallery-nav {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  padding: 8px 14px;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 999px;
  backdrop-filter: blur(4px);
}

.product__gallery-dot {
  width: 16px;
  height: 16px;
  border-radius: 999px;
  border: none;
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.product__gallery.is-dragging {
  cursor: grabbing;
}

.product__gallery-dot::after {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.3);
  transition: transform 160ms ease, background 160ms ease;
}

.product__gallery-dot.is-active::after {
  transform: scale(1.2);
  background: rgba(0, 0, 0, 0.6);
}

.product__gallery-dot.is-active {
  background: #fff;
}

.product__gallery-dot:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.product__details {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
  text-align: center;
  align-items: center;
}

.product__details h2 {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
  color: var(--dark);
}

.product__meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}

.product__meta strong {
  color: var(--dark);
  font-weight: 700;
}

.product__actions {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: center;
}

.product__qty-btn {
  width: 42px;
  height: 42px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 26px;
  font-weight: 600;
  color: var(--dark);
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

.product__qty-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
  background: var(--primary-light);
}

.product__qty-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
}

.product__qty {
  min-width: 32px;
  font-size: 18px;
  font-weight: 700;
  text-align: center;
  color: var(--dark);
}

.product__price {
  font-size: 26px;
  font-weight: 700;
  color: var(--primary);
  margin: 8px 0 16px;
}

.product__note {
  margin: 0;
  font-weight: 600;
  color: var(--dark);
}

.order {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 28px;
}

.order h2 {
  margin-top: 0;
  font-size: 26px;
}

.order__summary {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 24px;
  background: #f5fafc;
}

.order__summary h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.order__summary-empty {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.order__summary-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.order__summary-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 15px;
}

.order__summary-item span:last-child {
  font-weight: 700;
  color: var(--dark);
}

.order__total {
  margin-top: 16px;
  display: flex;
  justify-content: flex-end;
  align-items: baseline;
  gap: 8px;
  font-weight: 700;
  font-size: 22px;
  color: var(--dark);
}

.order__total-unit {
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
}

.order__section {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  margin: 0 0 20px;
}

.order__section legend {
  padding: 0 8px;
  font-weight: 600;
  color: var(--muted);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
  font-weight: 600;
  color: var(--dark);
}

.field input,
.field select {
  font: inherit;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fefefe;
  transition: border 120ms ease, box-shadow 120ms ease;
}

.field input[readonly] {
  background: #f4f6f8;
  color: var(--muted);
  cursor: default;
}

.payment-extra {
  display: none;
}

.payment-hint-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.payment-hint-field .payment-hint {
  margin: 0;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fefefe;
}


.payment-hint {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.5;
}

.payment-hint__emphasis {
  font-size: 16px;
  font-weight: 700;
  color: var(--muted);
}

.payment-hint .hint-code {
  font-family: 'Roboto Mono', 'Fira Mono', 'Courier New', monospace;
  font-size: 13px;
  background: rgba(0, 141, 166, 0.08);
  padding: 2px 6px;
  border-radius: 6px;
  display: inline-block;
  word-break: break-all;
}

.payment-hint__address {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.payment-hint__copy-btn {
  border: 1px solid rgba(0, 141, 166, 0.28);
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 12px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease, box-shadow 120ms ease;
}

.payment-hint__copy-btn:hover,
.payment-hint__copy-btn:focus-visible {
  background: rgba(0, 141, 166, 0.12);
  color: var(--primary);
  box-shadow: 0 6px 12px rgba(0, 141, 166, 0.15);
}

.payment-hint__copy-btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.field input:focus,
.field select:focus {
  border: 1px solid var(--primary);
  box-shadow: 0 0 0 4px rgba(255, 111, 174, 0.2);
  outline: none;
}

.order__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: flex-end;
}

.btn-primary,
.btn-secondary {
  border: none;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  padding: 12px 22px;
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-secondary {
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid rgba(0, 141, 166, 0.18);
}

.btn-primary:hover,
.btn-secondary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 14px rgba(45, 42, 68, 0.14);
}

.footer {
  text-align: center;
  padding: 32px 16px 48px;
  color: var(--muted);
  font-size: 14px;
}

.modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  z-index: 1000;
}

.modal[hidden] {
  display: none;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 17, 25, 0.6);
  backdrop-filter: blur(4px);
}

.modal__panel {
  position: relative;
  max-width: 640px;
  width: min(100%, 640px);
  background: #fff;
  border-radius: 20px;
  box-shadow: 0 24px 48px rgba(14, 22, 41, 0.22);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.modal__header h2 {
  margin: 0;
  font-size: 24px;
  color: var(--dark);
}

.modal__body {
  max-height: min(60vh, 520px);
  overflow-y: auto;
  padding-right: 8px;
}

.modal__list {
  margin: 0;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal__list > li {
  font-weight: 600;
  color: var(--dark);
}

.modal__list h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.modal__list ul {
  margin: 0;
  padding-left: 20px;
  font-weight: 400;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.modal__footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  flex-wrap: wrap;
}

.modal__btn {
  border: none;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  padding: 12px 22px;
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease,
    color 120ms ease;
}

.modal__btn--secondary {
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid rgba(0, 141, 166, 0.18);
}

.modal__btn--primary {
  background: var(--primary);
  color: #fff;
}

.modal__btn:hover,
.modal__btn:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(25, 36, 58, 0.16);
}

.modal__btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

@media (max-width: 600px) {
  .modal {
    padding: 16px;
  }

  .modal__panel {
    padding: 24px 20px;
  }

  .modal__header h2 {
    font-size: 20px;
  }
}

.footer__logo {
  margin-bottom: 16px;
  display: flex;
  justify-content: center;
}

.footer__logo img {
  max-width: 360px;
  height: auto;
}

.footer__contact {
  margin-bottom: 16px;
}

.footer__contact h3 {
  margin: 0 0 12px;
  font-size: 18px;
  color: var(--dark);
}

.footer__contact-links {
  display: flex;
  justify-content: center;
  gap: 14px;
}

.footer__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.footer__icon--x {
  background: #000;
}

.footer__icon--telegram {
  background: #27a6e5;
}

.footer__icon--mail {
  background: #e9ebef;
  color: var(--dark);
  font-weight: 600;
}

.footer__icon--mail img {
  width: 26px;
  height: 26px;
  display: block;
}

.footer__icon:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 14px rgba(0, 0, 0, 0.18);
}

@media (max-width: 640px) {
  main {
    padding: 0 18px 48px;
  }

  .order {
    padding: 24px 20px;
  }

  .order__summary {
    padding: 18px;
  }
}

@media (max-width: 900px) {
  main {
    padding: 0 20px 60px;
  }

  .product {
    margin: 48px 0;
  }

  .product__grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .product__card {
    padding: 20px;
  }

  .order {
    padding: 28px 22px;
  }

  .order__summary {
    padding: 20px;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 16px;
  }

  main {
    padding: 0 16px 40px;
  }

  .product__card {
    padding: 18px;
    gap: 16px;
  }

  .product__details h2 {
    font-size: 22px;
  }

  .product__price {
    font-size: 22px;
    margin-bottom: 12px;
  }

  .product__gallery-nav {
    bottom: 12px;
  }

  .product__qty-btn {
    width: 48px;
    height: 48px;
    font-size: 28px;
  }

  .product__qty {
    font-size: 20px;
  }

  .order__summary {
    padding: 18px;
  }

  .footer__contact h3 {
    font-size: 16px;
  }

  .footer__icon {
    width: 40px;
    height: 40px;
    font-size: 18px;
  }

  .footer__icon--mail img {
    width: 22px;
    height: 22px;
  }
}