/* ==========================================================================
   组件层 —— 工业实用
   规则：所有边框都是 1px 发丝线，所有圆角都很小，所有数字都等宽
   ========================================================================== */

/* --- 顶部滚动信息条 ---------------------------------------------------- */
.topbar {
  position: relative;
  z-index: 60;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-bg);
  overflow: hidden;
  height: 34px;
  display: flex;
  align-items: center;
}

.topbar__track {
  display: flex;
  gap: var(--space-6);
  white-space: nowrap;
  will-change: transform;
  animation: ticker 42s linear infinite;
}

.topbar__item {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-muted);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.topbar__item::before {
  content: "";
  width: 4px;
  height: 4px;
  background: var(--color-accent);
  flex: none;
}

@keyframes ticker {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

@media (prefers-reduced-motion: reduce) {
  .topbar__track { animation: none; }
}

/* --- 页头 -------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-line);
}

.header__inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  flex: none;
}

.brand__mark {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.22em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
}

.nav__link {
  position: relative;
  padding: 10px var(--space-3);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
  transition: color var(--dur-fast) ease-out;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: 10px;
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-base) var(--ease-out);
}

.nav__link:hover,
.nav__link[aria-current="page"] {
  color: var(--color-text);
}

.nav__link:hover::after,
.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: var(--space-4);
}

.icon-btn {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: border-color var(--dur-fast) ease-out, background var(--dur-fast) ease-out;
}

.icon-btn:hover {
  border-color: var(--color-line-strong);
  background: var(--color-surface);
}

.cart-btn {
  position: relative;
}

.cart-btn__count {
  position: absolute;
  top: 6px;
  right: 4px;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  display: grid;
  place-items: center;
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: 10px;
  border-radius: 2px;
}

.cart-btn__count[hidden] { display: none; }

.nav-toggle { display: none; }

/* --- 按钮 -------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: 0 var(--space-4);
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text);
  background: transparent;
  transition:
    background var(--dur-fast) ease-out,
    border-color var(--dur-fast) ease-out,
    color var(--dur-fast) ease-out,
    transform var(--dur-fast) ease-out;
}

.btn:hover {
  border-color: var(--color-text);
  background: var(--color-surface);
}

.btn:active { transform: translateY(1px); }

.btn:disabled {
  opacity: 0.42;
  cursor: not-allowed;
  transform: none;
}

.btn--primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
  font-weight: 600;
}

.btn--primary:hover {
  background: #ff5f33;
  border-color: #ff5f33;
  color: var(--color-accent-ink);
}

.btn--ghost {
  border-color: var(--color-line);
}

.btn--block { width: 100%; }

.btn--lg {
  min-height: 56px;
  padding-inline: var(--space-5);
  font-size: var(--text-sm);
}

/* --- 章节标题 ---------------------------------------------------------- */
.section {
  padding-block: var(--space-7);
  border-top: 1px solid var(--color-line);
}

.section__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

.section__index {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.2em;
  color: var(--color-accent);
  display: block;
  margin-bottom: var(--space-2);
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  text-transform: uppercase;
}

.section__link {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-muted);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--color-line-strong);
  transition: color var(--dur-fast) ease-out, border-color var(--dur-fast) ease-out;
}

.section__link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* --- 首屏 -------------------------------------------------------------- */
.hero {
  position: relative;
  padding-block: clamp(48px, 7vw, 96px) clamp(32px, 4vw, 56px);
  overflow: hidden;
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(24px, 4vw, 64px);
  align-items: center;
}

.hero__eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.hero__eyebrow-line {
  width: 48px;
  height: 1px;
  background: var(--color-accent);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  text-transform: uppercase;
  line-height: 0.86;
  letter-spacing: -0.045em;
  margin-bottom: var(--space-4);
}

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

.hero__lede {
  max-width: 46ch;
  color: var(--color-muted);
  font-size: var(--text-md);
  line-height: 1.65;
  margin-bottom: var(--space-5);
}

.hero__cta {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.hero__media {
  position: relative;
  aspect-ratio: 4 / 3.1;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  overflow: hidden;
}

.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.04) saturate(0.95);
  animation: heroZoom 18s ease-out infinite alternate;
}

@keyframes heroZoom {
  from { transform: scale(1); }
  to   { transform: scale(1.06); }
}

@media (prefers-reduced-motion: reduce) {
  .hero__media img { animation: none; }
}

/* 技术标注：一条横穿图片的发丝线 + 角标，暗示图纸感 */
.hero__annot {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__annot::before {
  content: "";
  position: absolute;
  left: 0; right: 0;
  top: 62%;
  height: 1px;
  background: rgba(255, 74, 28, 0.5);
}

.hero__annot-label {
  position: absolute;
  left: var(--space-3);
  top: calc(62% + 6px);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.hero__tag {
  position: absolute;
  right: var(--space-3);
  bottom: var(--space-3);
  padding: 6px 10px;
  background: rgba(10, 10, 11, 0.82);
  border: 1px solid var(--color-line-strong);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* 让图片破格冲出容器右边缘 */
@media (min-width: 1100px) {
  .hero__media {
    margin-right: calc(var(--gutter) * -1);
  }
}

/* --- 数据条 ------------------------------------------------------------ */
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.stats__item {
  padding: var(--space-4) var(--space-3);
  border-right: 1px solid var(--color-line);
}

.stats__item:last-child { border-right: none; }

.stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  display: block;
}

.stats__num span {
  font-size: 0.5em;
  color: var(--color-muted);
  margin-left: 4px;
}

.stats__label {
  display: block;
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
}

/* --- 车型入口卡 -------------------------------------------------------- */
.fitment {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
}

.fitment__card {
  position: relative;
  display: block;
  min-height: 320px;
  padding: var(--space-4);
  background: var(--color-bg);
  overflow: hidden;
  isolation: isolate;
}

.fitment__img {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.fitment__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.34;
  filter: grayscale(0.55) contrast(1.1);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}

.fitment__card::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(to top, var(--color-bg) 8%, rgba(10, 10, 11, 0.35) 55%, transparent);
}

.fitment__card:hover .fitment__img img {
  opacity: 0.6;
  transform: scale(1.05);
}

.fitment__no {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.2em;
  color: var(--color-accent);
}

.fitment__title {
  margin-top: auto;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2vw, 1.75rem);
  text-transform: uppercase;
  line-height: 1.02;
}

.fitment__desc {
  margin-top: var(--space-2);
  color: var(--color-muted);
  font-size: var(--text-sm);
  max-width: 30ch;
}

.fitment__foot {
  margin-top: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--color-line);
  padding-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.fitment__card {
  display: flex;
  flex-direction: column;
}

.fitment__card:hover .fitment__foot { color: var(--color-text); }

/* --- 商品卡 ------------------------------------------------------------ */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4) var(--space-3);
}

.product-card {
  position: relative;
  display: flex;
  flex-direction: column;
}

.product-card__media {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  overflow: hidden;
  transition: border-color var(--dur-fast) ease-out;
}

.product-card:hover .product-card__media {
  border-color: var(--color-line-strong);
}

.product-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-slow) var(--ease-out);
}

.product-card:hover .product-card__media img {
  transform: scale(1.045);
}

.product-card__badge {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  padding: 4px 7px;
  background: var(--color-bg);
  border: 1px solid var(--color-line-strong);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.product-card__badge--sale {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.product-card__quick {
  position: absolute;
  z-index: 2;
  left: 0; right: 0; bottom: 0;
  padding: 10px;
  border-top: 1px solid var(--color-line-strong);
  background: rgba(10, 10, 11, 0.9);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-align: center;
  transform: translateY(100%);
  transition: transform var(--dur-base) var(--ease-out), background var(--dur-fast) ease-out;
}

.product-card:hover .product-card__quick,
.product-card:focus-within .product-card__quick {
  transform: translateY(0);
}

.product-card__quick:hover {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.product-card__body {
  padding-top: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.product-card__fit {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-faint);
}

.product-card__title {
  font-size: var(--text-sm);
  line-height: 1.45;
  font-weight: 400;
  color: var(--color-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-card__title a::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
}

.product-card__price {
  margin-top: auto;
  padding-top: var(--space-2);
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-sm);
}

.product-card__price s {
  color: var(--color-faint);
  font-size: var(--text-xs);
}

.product-card__price small {
  color: var(--color-faint);
  font-size: 10px;
  letter-spacing: 0.1em;
}

/* --- 分类页工具条 ------------------------------------------------------ */
.page-head {
  padding-block: clamp(32px, 5vw, 64px) var(--space-4);
  border-bottom: 1px solid var(--color-line);
}

.page-head__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  text-transform: uppercase;
}

.page-head__desc {
  margin-top: var(--space-3);
  color: var(--color-muted);
  max-width: 60ch;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--color-line);
  flex-wrap: wrap;
  position: sticky;
  top: var(--header-h);
  z-index: 20;
  background: var(--color-bg);
}

.filters {
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 2px;
}

.filters::-webkit-scrollbar { display: none; }

.chip {
  flex: none;
  min-height: 36px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
  display: inline-flex;
  align-items: center;
  transition: color var(--dur-fast) ease-out, border-color var(--dur-fast) ease-out;
}

.chip:hover { color: var(--color-text); border-color: var(--color-line-strong); }

.chip[aria-pressed="true"] {
  color: var(--color-accent-ink);
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.select {
  min-height: 36px;
  padding: 0 var(--space-3);
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text);
}

.result-count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-muted);
  letter-spacing: 0.08em;
}

/* --- 商品详情 ---------------------------------------------------------- */
.pdp {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(24px, 4vw, 64px);
  padding-block: var(--space-5) var(--space-7);
  align-items: start;
}

.gallery {
  display: grid;
  gap: var(--space-2);
}

.gallery__main {
  aspect-ratio: 1 / 1;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  overflow: hidden;
}

.gallery__main img {
  width: 100%; height: 100%;
  object-fit: contain;
  padding: var(--space-4);
}

.gallery__thumbs {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.gallery__thumb {
  width: 76px;
  height: 76px;
  border: 1px solid var(--color-line);
  background: var(--color-surface);
  padding: 6px;
  overflow: hidden;
}

.gallery__thumb img { width: 100%; height: 100%; object-fit: cover; }

.gallery__thumb[aria-pressed="true"] { border-color: var(--color-accent); }

.pdp__info {
  position: sticky;
  top: calc(var(--header-h) + var(--space-4));
}

.pdp__fit {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.pdp__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.6vw, 2.25rem);
  text-transform: uppercase;
  line-height: 1.02;
  margin-bottom: var(--space-3);
}

.pdp__price {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding-block: var(--space-3);
  border-block: 1px solid var(--color-line);
  margin-bottom: var(--space-4);
}

.pdp__price-now {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-variant-numeric: tabular-nums;
}

.pdp__price-now small {
  font-size: 0.45em;
  color: var(--color-muted);
  letter-spacing: 0.1em;
  margin-left: 6px;
}

.pdp__price-was {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-faint);
  text-decoration: line-through;
}

.pdp__desc {
  color: var(--color-muted);
  font-size: var(--text-base);
  margin-bottom: var(--space-4);
}

.variant-group { margin-bottom: var(--space-4); }

.variant-group__label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-2);
}

.variant-options {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.variant-option {
  min-height: 44px;
  min-width: 56px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--dur-fast) ease-out;
}

.variant-option:hover { color: var(--color-text); border-color: var(--color-text); }

.variant-option[aria-pressed="true"] {
  background: var(--color-text);
  border-color: var(--color-text);
  color: var(--color-bg);
}

.variant-option:disabled {
  opacity: 0.35;
  text-decoration: line-through;
  cursor: not-allowed;
}

.buy-row {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.qty {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  height: 56px;
  flex: none;
}

.qty button {
  width: 44px;
  height: 100%;
  display: grid;
  place-items: center;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-md);
}

.qty button:hover { color: var(--color-text); }

.qty output {
  min-width: 34px;
  text-align: center;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.buy-row .btn { flex: 1; }

.pdp__meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-muted);
}

.pdp__meta li {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
}

.pdp__meta b {
  font-weight: 400;
  color: var(--color-text);
  text-align: right;
}

/* --- 折叠面板 ---------------------------------------------------------- */
.accordion {
  border-top: 1px solid var(--color-line);
  margin-top: var(--space-5);
}

.accordion__item { border-bottom: 1px solid var(--color-line); }

.accordion__trigger {
  width: 100%;
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text);
  text-align: left;
}

.accordion__trigger::after {
  content: "+";
  font-size: var(--text-md);
  color: var(--color-muted);
  transition: transform var(--dur-base) var(--ease-out);
}

.accordion__trigger[aria-expanded="true"]::after {
  content: "−";
  color: var(--color-accent);
}

.accordion__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur-base) var(--ease-out);
}

.accordion__panel[data-open="true"] {
  grid-template-rows: 1fr;
}

.accordion__inner {
  overflow: hidden;
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.accordion__inner > div { padding-bottom: var(--space-4); }

.accordion__inner ul { display: grid; gap: 6px; }

.accordion__inner li {
  display: flex;
  gap: var(--space-2);
}

.accordion__inner li::before {
  content: "—";
  color: var(--color-accent);
  flex: none;
}

/* --- 购物车页 ---------------------------------------------------------- */
.cart-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
  padding-block: var(--space-5) var(--space-7);
  align-items: start;
}

.cart-line {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr) auto;
  gap: var(--space-3);
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--color-line);
  align-items: start;
}

.cart-line__media {
  width: 96px;
  height: 96px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  overflow: hidden;
}

.cart-line__media img { width: 100%; height: 100%; object-fit: cover; }

.cart-line__title {
  font-size: var(--text-sm);
  line-height: 1.4;
  margin-bottom: 4px;
}

.cart-line__variant {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--color-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.cart-line__controls {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.cart-line__remove {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.1em;
  color: var(--color-faint);
  text-transform: uppercase;
  min-height: 32px;
}

.cart-line__remove:hover { color: var(--color-danger); }

.cart-line__price {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
  white-space: nowrap;
}

.qty--sm {
  height: 36px;
}

.qty--sm button { width: 34px; }

.cart-summary {
  border: 1px solid var(--color-line);
  padding: var(--space-4);
  background: var(--color-bg-elevated);
  position: sticky;
  top: calc(var(--header-h) + var(--space-4));
}

.cart-summary__row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.cart-summary__row b {
  font-weight: 400;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

.cart-summary__total {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-block: var(--space-3);
  border-top: 1px solid var(--color-line-strong);
  margin-top: var(--space-2);
  margin-bottom: var(--space-4);
}

.cart-summary__total span {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.cart-summary__total b {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-lg);
  font-weight: 400;
}

.summary-note {
  margin-top: var(--space-3);
  font-size: var(--text-2xs);
  color: var(--color-faint);
  line-height: 1.6;
}

/* --- 空态 -------------------------------------------------------------- */
.empty {
  border: 1px dashed var(--color-line-strong);
  padding: var(--space-6) var(--space-4);
  text-align: center;
}

.empty__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.empty__text {
  color: var(--color-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

/* --- 购物车抽屉 -------------------------------------------------------- */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: rgba(0, 0, 0, 0.6);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out);
}

.overlay[data-open="true"] {
  opacity: 1;
  pointer-events: auto;
}

.drawer {
  position: fixed;
  top: 0; right: 0; bottom: 0;
  z-index: 90;
  width: min(440px, 100%);
  display: flex;
  flex-direction: column;
  background: var(--color-bg-elevated);
  border-left: 1px solid var(--color-line-strong);
  transform: translateX(100%);
  transition: transform var(--dur-base) var(--ease-out);
}

.drawer[data-open="true"] { transform: none; }

.drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-line);
}

.drawer__title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.drawer__body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-3) var(--space-4);
}

.drawer__foot {
  border-top: 1px solid var(--color-line);
  padding: var(--space-4);
}

.drawer-line {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) auto;
  gap: var(--space-3);
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--color-line);
}

.drawer-line__media {
  width: 64px; height: 64px;
  border: 1px solid var(--color-line);
  overflow: hidden;
  background: var(--color-surface);
}

.drawer-line__media img { width: 100%; height: 100%; object-fit: cover; }

.drawer-line__title {
  font-size: var(--text-xs);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.drawer-line__meta {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-faint);
  letter-spacing: 0.08em;
  margin-top: 4px;
}

.drawer-line__price {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
}

/* --- 提示条 ------------------------------------------------------------ */
.toast {
  position: fixed;
  left: 50%;
  bottom: var(--space-5);
  z-index: 120;
  transform: translate(-50%, 140%);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2);
  border: 1px solid var(--color-line-strong);
  box-shadow: var(--shadow-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  transition: transform var(--dur-base) var(--ease-out);
  max-width: calc(100vw - 32px);
}

.toast[data-open="true"] { transform: translate(-50%, 0); }

.toast::before {
  content: "";
  width: 6px; height: 6px;
  background: var(--color-accent);
  flex: none;
}

/* --- 移动端固定购买条（仅详情页） -------------------------------------- */
.mobile-buy { display: none; }

@media (max-width: 900px) {
  .mobile-buy {
    display: flex;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 70;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-2) var(--gutter) calc(var(--space-2) + env(safe-area-inset-bottom));
    background: color-mix(in srgb, var(--color-bg) 92%, transparent);
    backdrop-filter: blur(14px);
    border-top: 1px solid var(--color-line-strong);
  }

  .mobile-buy__price {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
    font-size: var(--text-md);
    display: block;
    line-height: 1.2;
  }

  .mobile-buy__label {
    display: block;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--color-muted);
  }

  .mobile-buy .btn { flex: none; }

  body.has-mobile-buy { padding-bottom: 84px; }
}

/* --- 结尾行动区 -------------------------------------------------------- */
.closer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-5);
  align-items: end;
}

.closer__title {
  font-size: clamp(2rem, 5.5vw, 4.25rem);
  line-height: 0.9;
}

@media (max-width: 900px) {
  .closer {
    grid-template-columns: 1fr;
    align-items: start;
    gap: var(--space-4);
  }

  .closer .btn { width: 100%; }
}

/* --- 页脚 -------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--color-line);
  padding-block: var(--space-6) var(--space-4);
  position: relative;
  z-index: 2;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--space-5);
  padding-bottom: var(--space-5);
}

.footer__brand {
  font-family: var(--font-display);
  font-size: 1.4rem;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.footer__addr {
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: 1.7;
  font-style: normal;
}

.footer__col-title {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-faint);
  margin-bottom: var(--space-3);
}

.footer__list { display: grid; gap: 10px; }

.footer__list a {
  font-size: var(--text-sm);
  color: var(--color-muted);
  transition: color var(--dur-fast) ease-out;
}

.footer__list a:hover { color: var(--color-accent); }

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.1em;
  color: var(--color-faint);
  flex-wrap: wrap;
}

.pay-row {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

.pay-badge {
  padding: 3px 7px;
  border: 1px solid var(--color-line);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--color-muted);
}

/* --- 加载骨架 ---------------------------------------------------------- */
.skeleton {
  background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-surface-2) 50%, var(--color-surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s linear infinite;
  border: 1px solid var(--color-line);
  aspect-ratio: 1 / 1;
}

@keyframes shimmer {
  from { background-position: 200% 0; }
  to   { background-position: -200% 0; }
}

@media (prefers-reduced-motion: reduce) {
  .skeleton { animation: none; }
}

/* ==========================================================================
   响应式：768（平板）/ 375（手机）
   ========================================================================== */

@media (max-width: 1200px) {
  .product-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .nav { display: none; }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .hero__grid { grid-template-columns: 1fr; }

  .hero__media {
    order: -1;
    aspect-ratio: 16 / 10;
  }

  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .stats__item:nth-child(2) { border-right: none; }

  .stats__item:nth-child(-n + 2) { border-bottom: 1px solid var(--color-line); }

  .fitment { grid-template-columns: 1fr; }

  .fitment__card { min-height: 220px; }

  .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .pdp { grid-template-columns: 1fr; }

  .pdp__info { position: static; }

  .cart-layout { grid-template-columns: 1fr; }

  .cart-summary { position: static; }
}

@media (max-width: 560px) {
  :root { --header-h: 60px; }

  .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4) 10px; }

  .product-card__quick { display: none; }

  .cart-line { grid-template-columns: 72px minmax(0, 1fr); }

  .cart-line__media { width: 72px; height: 72px; }

  .cart-line__price { grid-column: 2; text-align: left; margin-top: var(--space-2); }

  .section { padding-block: var(--space-6); }

  .footer__grid { grid-template-columns: 1fr; gap: var(--space-4); }

  .hero__title { font-size: clamp(2.25rem, 11vw, 3.25rem); }
}

/* 站点级移动端菜单 */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 95;
  background: var(--color-bg);
  transform: translateY(-100%);
  transition: transform var(--dur-base) var(--ease-out);
  display: flex;
  flex-direction: column;
  padding: var(--space-4);
}

.mobile-menu[data-open="true"] { transform: none; }

.mobile-menu__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-line);
}

.mobile-menu__link {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-line);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  text-transform: uppercase;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mobile-menu__link span {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--color-faint);
  letter-spacing: 0.12em;
}