/* ==========================================================================
   components.css — 按钮、卡片、导航、轮播、页脚等可复用组件
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 按钮
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  min-height: 48px;               /* 触摸目标下限 44px，留 4px 余量 */
  padding: 0.875rem 1.5rem;
  border-radius: var(--r-md);
  font-size: var(--fs-body);
  font-weight: 600;
  line-height: 1.2;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), transform 0.15s var(--ease);
}

.btn:active {
  transform: scale(0.98);
}

.btn__arrow {
  flex: none;
  width: 16px;
  height: 16px;
  transition: transform var(--dur) var(--ease);
}

.btn--primary {
  background: var(--c-black);
  color: var(--c-white);
}

.btn--secondary {
  background: transparent;
  color: var(--c-text);
  border: 1px solid var(--c-text);
}

.btn--light {
  background: var(--c-white);
  color: var(--c-black);
}

/* hover 效果只在真正支持悬停的设备上生效，避免移动端点击后卡在 hover 态 */
@media (hover: hover) {
  .btn--primary:hover { background: #262626; }
  .btn--secondary:hover { background: var(--c-black); color: var(--c-white); }
  .btn--light:hover { background: #ececec; }
  .btn:hover .btn__arrow { transform: translate(2px, -2px); }
}

/* 下划线文字链接，卡片底部的「了解更多 ↗」 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding-block: 0.5rem;          /* 撑高触摸目标 */
  font-size: var(--fs-sm);
  font-weight: 500;
  border-bottom: 1px solid currentColor;
  line-height: 1.2;
  transition: opacity var(--dur) var(--ease);
}

.link-arrow svg {
  width: 12px;
  height: 12px;
  transition: transform var(--dur) var(--ease);
}

@media (hover: hover) {
  .link-arrow:hover { opacity: 0.6; }
  .link-arrow:hover svg { transform: translate(2px, -2px); }
}

/* 「新品」等小标签 */
.badge {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  border-radius: var(--r-pill);
  background: var(--c-accent);
  color: var(--c-white);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0;
  vertical-align: middle;
}

/* --------------------------------------------------------------------------
   2. 顶部公告条
   -------------------------------------------------------------------------- */
.announce {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  min-height: 56px;
  padding: 0.75rem calc(var(--gutter) * 0.6) 0.75rem 3rem;
  background: var(--c-surface-2);
  border-bottom: 1px solid var(--c-border);
  font-size: var(--fs-sm);
  text-align: center;
}

.announce[hidden] {
  display: none;
}

.announce__close {
  position: absolute;
  left: max(0.75rem, env(safe-area-inset-left));
  top: 50%;
  transform: translateY(-50%);
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--r-pill);
}

.announce__close svg {
  width: 14px;
  height: 14px;
}

@media (hover: hover) {
  .announce__close:hover { background: rgba(0, 0, 0, 0.06); }
}

/* --------------------------------------------------------------------------
   3. 导航栏
   -------------------------------------------------------------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.nav.is-scrolled {
  border-bottom-color: var(--c-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--nav-h);
}

.nav__right {
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 2vw, 1.75rem);
}

/* 桌面横向菜单，1024 以下隐藏 */
.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2rem);
  font-size: var(--fs-sm);
  font-weight: 500;
}

.nav__links a {
  padding-block: 0.5rem;
  transition: opacity var(--dur) var(--ease);
}

@media (hover: hover) {
  .nav__links a:hover { opacity: 0.55; }
}

/* 语言切换 */
.lang-switch {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  border-radius: var(--r-pill);
  background: var(--c-surface);
}

.lang-switch__btn {
  min-width: 40px;
  min-height: 32px;
  padding-inline: 0.625rem;
  border-radius: var(--r-pill);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--c-text-muted);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.lang-switch__btn.is-active {
  background: var(--c-white);
  color: var(--c-text);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* 汉堡按钮，1024 以上隐藏 */
.nav__burger {
  display: none;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-right: -10px;
  border-radius: var(--r-sm);
}

.nav__burger span {
  position: relative;
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity 0.2s linear;
}

.nav__burger span::before,
.nav__burger span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease);
}

.nav__burger span::before { top: -6px; }
.nav__burger span::after  { top: 6px; }

.nav__burger.is-open span { background: transparent; }
.nav__burger.is-open span::before { transform: translateY(6px) rotate(45deg); }
.nav__burger.is-open span::after  { transform: translateY(-6px) rotate(-45deg); }

/* 全屏覆盖菜单 */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  display: flex;
  flex-direction: column;
  padding: calc(var(--nav-h) + 2rem) var(--gutter)
    max(2rem, env(safe-area-inset-bottom));
  background: var(--c-bg);
  overflow-y: auto;
  overscroll-behavior: contain;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease),
    visibility var(--dur);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.mobile-menu__group + .mobile-menu__group {
  margin-top: 2.5rem;
}

.mobile-menu__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: 1rem;
}

.mobile-menu__list a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 52px;
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  border-bottom: 1px solid var(--c-border);
}

/* body 锁滚动（菜单打开时） */
body.is-locked {
  overflow: hidden;
}

/* --------------------------------------------------------------------------
   4. 产品图标容器
   -------------------------------------------------------------------------- */
/* 宽度写死而不是 100%：父容器一旦是 justify-items: center，
   百分比宽度会塌成 0，图标就整个消失 */
.app-icon {
  display: block;
  width: min(110px, 70vw);
  aspect-ratio: 1;
  border-radius: 22.5%;           /* 近似 macOS 图标的连续圆角 */
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.app-icon svg,
.app-icon img {
  width: 100%;
  height: 100%;
}

/* 官方 PNG 图标自带圆角和投影，容器不要再叠一层 */
.app-icon:has(img) {
  border-radius: 0;
  box-shadow: none;
  overflow: visible;
}

.app-icon img {
  object-fit: contain;
}

.app-icon--lg { width: min(200px, 55vw); }
.app-icon--xl { width: min(280px, 60vw); }

/* --------------------------------------------------------------------------
   5. 产品网格卡片
   -------------------------------------------------------------------------- */
.product-grid {
  display: grid;
  gap: var(--card-gap);
  grid-template-columns: repeat(4, 1fr);
}

.product-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: clamp(1.25rem, 2vw, 1.75rem);
  border-radius: var(--r-lg);
  background: var(--c-surface);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

@media (hover: hover) {
  .product-card:hover {
    background: #e9e9e9;
    transform: translateY(-4px);
  }
}

.product-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.product-card__name {
  font-size: var(--fs-h3);
}

.product-card__tagline {
  font-size: var(--fs-body);
  color: var(--c-text-muted);
  line-height: 1.35;
}

.product-card__icon {
  display: grid;
  place-items: center;
  flex: 1;
  min-height: 140px;
  padding-block: 1.5rem;
}

.product-card__foot {
  margin-top: auto;
}

/* --------------------------------------------------------------------------
   6. Hero 轮播
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding-block: clamp(1.5rem, 3vw, 3rem);
}

.hero__viewport {
  overflow: hidden;
  border-radius: var(--r-xl);
  background: var(--c-surface);
  touch-action: pan-y;            /* 允许纵向滚动，横向手势交给轮播 */
}

.hero__track {
  display: flex;
  transition: transform 0.55s var(--ease);
  will-change: transform;
}

.hero__slide {
  flex: 0 0 100%;
  min-width: 0;
  display: grid;
  align-items: center;
  gap: clamp(1.5rem, 4vw, 4rem);
  grid-template-columns: 1fr 1fr;
  padding: clamp(2rem, 5vw, 4.5rem) clamp(1.5rem, 5vw, 5rem);
  min-height: clamp(360px, 52vh, 560px);
}

.hero__media {
  display: grid;
  place-items: center;
}

.hero__body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: clamp(0.75rem, 1.5vw, 1.25rem);
}

.hero__name {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.625rem;
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
}

.hero__tagline {
  font-size: var(--fs-h3);
}

.hero__desc {
  font-size: var(--fs-lead);
  color: var(--c-text-muted);
  max-width: 46ch;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(0.5rem, 2vw, 1.5rem);
}

/* 左右箭头 */
.hero__arrow {
  position: absolute;
  top: 50%;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: var(--r-pill);
  background: var(--c-white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.12);
  transform: translateY(-50%);
  transition: background var(--dur) var(--ease), transform 0.15s var(--ease);
}

.hero__arrow svg { width: 18px; height: 18px; }
.hero__arrow--prev { left: clamp(0.5rem, 1.5vw, 1.5rem); }
.hero__arrow--next { right: clamp(0.5rem, 1.5vw, 1.5rem); }
.hero__arrow:active { transform: translateY(-50%) scale(0.94); }

@media (hover: hover) {
  .hero__arrow:hover { background: #f2f2f2; }
}

/* 圆点指示器 */
.hero__dots {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.hero__dot {
  width: 32px;
  height: 32px;                   /* 触摸目标，视觉上只有中间那条 */
  display: grid;
  place-items: center;
}

.hero__dot::after {
  content: "";
  display: block;
  width: 24px;
  height: 4px;
  border-radius: var(--r-pill);
  background: #d4d4d4;
  transition: background var(--dur) var(--ease), width var(--dur) var(--ease);
}

.hero__dot.is-active::after {
  width: 32px;
  background: var(--c-black);
}

/* --------------------------------------------------------------------------
   7. 页脚
   -------------------------------------------------------------------------- */
.footer {
  padding-block: var(--section-gap) 2rem;
  border-top: 1px solid var(--c-border);
}

.footer__cols {
  display: grid;
  gap: clamp(2rem, 4vw, 3rem);
  grid-template-columns: repeat(4, 1fr);
}

.footer__title {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: 1rem;
}

.footer__list li + li {
  margin-top: 0.625rem;
}

.footer__list a {
  display: inline-block;
  padding-block: 0.25rem;
  font-size: var(--fs-sm);
  transition: opacity var(--dur) var(--ease);
}

@media (hover: hover) {
  .footer__list a:hover { opacity: 0.55; }
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding-top: 1.5rem;
  padding-bottom: env(safe-area-inset-bottom);
  border-top: 1px solid var(--c-border);
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
}

/* --------------------------------------------------------------------------
   8. FAQ 折叠
   -------------------------------------------------------------------------- */
.faq__item {
  border-bottom: 1px solid var(--c-border);
}

.faq__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  width: 100%;
  min-height: 64px;
  padding-block: 1.25rem;
  text-align: left;
  font-size: var(--fs-h3);
  font-weight: var(--fw-heading);
  letter-spacing: var(--tracking-heading);
}

.faq__icon {
  flex: none;
  width: 18px;
  height: 18px;
  transition: transform var(--dur) var(--ease);
}

.faq__item.is-open .faq__icon {
  transform: rotate(45deg);
}

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

.faq__item.is-open .faq__a {
  grid-template-rows: 1fr;
}

.faq__a > div {
  overflow: hidden;
}

.faq__a p {
  padding-bottom: 1.5rem;
  max-width: 68ch;
  color: var(--c-text-muted);
  font-size: var(--fs-body);
}

/* ==========================================================================
   响应式：断点从大到小逐级覆盖
   ========================================================================== */

/* md 及以下（≤1279）：小笔记本 / iPad Pro 横屏 —— 产品网格转 3 列 */
@media (max-width: 1279px) {
  .product-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* sm 及以下（≤1023）：iPad 竖屏 —— 导航转汉堡，Hero 转上下堆叠 */
@media (max-width: 1023px) {
  .nav__links {
    display: none;
  }

  .nav__burger {
    display: grid;
  }

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

  .hero__slide {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    gap: clamp(1.5rem, 4vw, 2.5rem);
    min-height: 0;
  }

  .hero__body {
    align-items: center;
  }

  .hero__actions {
    justify-content: center;
  }

  /* 箭头压到轮播底部，避免遮挡居中的内容 */
  .hero__arrow {
    top: auto;
    bottom: -4px;
    transform: none;
    width: 44px;
    height: 44px;
  }

  .hero__arrow:active { transform: scale(0.94); }
  .hero__arrow--prev { left: calc(50% - 88px); }
  .hero__arrow--next { right: calc(50% - 88px); }

  .hero__dots {
    margin-top: 1rem;
  }

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

/* xs 及以下（≤767）：手机 —— 全部单列 */
@media (max-width: 767px) {
  .product-grid {
    grid-template-columns: 1fr;
  }

  .hero__viewport {
    border-radius: var(--r-lg);
  }

  .product-card__icon {
    min-height: 120px;
  }

  /* 手机上文案容易换行，让链接单独占一行，避免和文字挤在一起 */
  .announce {
    flex-wrap: wrap;
    text-align: left;
    padding-left: 3.25rem;
    justify-content: flex-start;
    gap: 0.25rem 0.75rem;
  }

  .announce > span {
    flex: 1 1 100%;
  }

  /* 手机上按钮撑满一行更好点 */
  .hero__actions .btn {
    flex: 1 1 auto;
    min-width: 160px;
    justify-content: center;
  }

  .hero__actions .btn__arrow {
    margin-left: 0.5rem;
  }
}

/* xxs（≤479）：小屏手机 */
@media (max-width: 479px) {
  .footer__cols {
    grid-template-columns: 1fr;
  }

  .hero__actions {
    width: 100%;
    flex-direction: column;
  }

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

/* ==========================================================================
   品牌锁定：标志 + 字标
   ========================================================================== */
.nav__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.nav__logo svg {
  width: 26px;
  height: 26px;
  flex: none;
}

/* 字标：紧排大写。刀锋只有直边和平切，大写字母同样只有直边，是一套语言 */
.nav__word {
  font-size: 1.25rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}