/* ============================================================
   咕噜掌柜官网 · Components
   按钮 / 导航 / 抽屉 / 截图框 / 灯箱 / 页脚
   ============================================================ */

/* ------------------------------------------------------------
   按钮
   ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--r-sm);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: background-color var(--dur-1) var(--ease),
    color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease),
    transform var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease);
}

.btn svg {
  width: 16px;
  height: 16px;
  flex: none;
  transition: transform var(--dur-1) var(--ease);
}

/* 主按钮 */
.btn--primary {
  background: var(--c-brand-strong);
  color: #fff;
  box-shadow: 0 1px 2px rgba(37, 41, 35, 0.08);
}

.btn--primary:hover {
  background: var(--c-brand-deep);
}

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

/* 次按钮 */
.btn--ghost {
  background: transparent;
  color: var(--c-ink);
  border-color: var(--c-line-strong);
}

.btn--ghost:hover {
  border-color: var(--c-ink-3);
  background: rgba(37, 41, 35, 0.02);
}

/* 文字链接按钮 */
.btn--link {
  min-height: 0;
  padding: 0;
  color: var(--c-brand-ink);
  font-weight: 600;
  gap: 6px;
}

.btn--link:hover svg {
  transform: translateX(3px);
}

.btn--sm {
  min-height: 38px;
  padding: 0 16px;
  font-size: var(--fs-xs);
}

.btn--lg {
  min-height: 50px;
  padding: 0 28px;
  font-size: var(--fs-body);
}

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

/* ------------------------------------------------------------
   顶部导航
   ------------------------------------------------------------ */
.site-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid transparent;
  transition: background-color var(--dur-2) var(--ease),
    border-color var(--dur-2) var(--ease), box-shadow var(--dur-2) var(--ease);
}

@supports (backdrop-filter: blur(12px)) {
  .site-nav {
    backdrop-filter: saturate(140%) blur(14px);
    -webkit-backdrop-filter: saturate(140%) blur(14px);
  }
}

.site-nav.is-scrolled {
  background: rgba(255, 255, 255, 0.94);
  border-bottom-color: var(--c-line);
  box-shadow: 0 1px 0 rgba(37, 41, 35, 0.02);
}

.site-nav__inner {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
  height: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: none;
  font-size: 1.0625rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 9px;
}

.site-nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-inline: auto;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 36px;
  padding: 0 12px;
  border-radius: var(--r-sm);
  font-size: var(--fs-sm);
  color: var(--c-ink-2);
  transition: color var(--dur-1) var(--ease), background-color var(--dur-1) var(--ease);
}

.site-nav__link:hover {
  color: var(--c-ink);
  background: rgba(37, 41, 35, 0.04);
}

.site-nav__link[aria-current="page"] {
  color: var(--c-ink);
  font-weight: 600;
}

.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: -1px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-brand);
}

.site-nav__link svg {
  width: 12px;
  height: 12px;
  opacity: 0.55;
}

.site-nav__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex: none;
}

/* 下拉菜单（纯 CSS + 键盘可用） */
.nav-drop {
  position: relative;
}

.nav-drop__panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translate(-50%, -6px);
  min-width: 260px;
  padding: var(--sp-2);
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  box-shadow: var(--sh-md);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-1) var(--ease), transform var(--dur-1) var(--ease),
    visibility var(--dur-1);
}

.nav-drop:hover .nav-drop__panel,
.nav-drop:focus-within .nav-drop__panel {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.nav-drop__item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--r-sm);
  transition: background-color var(--dur-1) var(--ease);
}

.nav-drop__item:hover {
  background: var(--c-brand-tint);
}

.nav-drop__item svg {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  flex: none;
  color: var(--c-brand-deep);
  opacity: 1;
}

.nav-drop__item strong {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 600;
  line-height: 1.4;
}

.nav-drop__item span {
  display: block;
  font-size: var(--fs-xs);
  color: var(--c-ink-3);
  line-height: 1.5;
}

/* 汉堡按钮（仅移动端） */
.nav-burger {
  display: none;
  width: 40px;
  height: 40px;
  margin-left: auto;
  place-items: center;
  border-radius: var(--r-sm);
  color: var(--c-ink);
}

.nav-burger:hover {
  background: rgba(37, 41, 35, 0.05);
}

.nav-burger svg {
  width: 20px;
  height: 20px;
}

/* ------------------------------------------------------------
   移动端抽屉
   ------------------------------------------------------------ */
.drawer {
  position: fixed;
  inset: 0;
  z-index: var(--z-drawer);
  display: none;
}

.drawer.is-open {
  display: block;
}

.drawer__scrim {
  position: absolute;
  inset: 0;
  background: rgba(37, 41, 35, 0.36);
  opacity: 0;
  transition: opacity var(--dur-2) var(--ease);
}

.drawer.is-open .drawer__scrim {
  opacity: 1;
}

.drawer__panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(340px, 86vw);
  display: flex;
  flex-direction: column;
  background: var(--c-bg);
  box-shadow: var(--sh-lg);
  transform: translateX(100%);
  transition: transform var(--dur-2) var(--ease);
  overscroll-behavior: contain;
}

.drawer.is-open .drawer__panel {
  transform: translateX(0);
}

.drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  padding-inline: var(--sp-5);
  border-bottom: 1px solid var(--c-line);
  flex: none;
}

.drawer__close {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: var(--r-sm);
  color: var(--c-ink-2);
}

.drawer__close svg {
  width: 20px;
  height: 20px;
}

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

.drawer__group-title {
  padding: var(--sp-3) var(--sp-3) var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--c-ink-3);
}

.drawer__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px var(--sp-3);
  border-radius: var(--r-sm);
  font-size: var(--fs-body);
  color: var(--c-ink);
}

.drawer__link:hover {
  background: rgba(37, 41, 35, 0.04);
}

.drawer__link svg {
  width: 16px;
  height: 16px;
  color: var(--c-ink-3);
}

.drawer__foot {
  padding: var(--sp-4) var(--sp-5) calc(var(--sp-5) + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--c-line);
  display: grid;
  gap: var(--sp-2);
  flex: none;
}

/* ------------------------------------------------------------
   产品截图框（可点击放大）
   ------------------------------------------------------------ */
.frame {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--sh-md);
  transition: box-shadow var(--dur-2) var(--ease), transform var(--dur-2) var(--ease);
}

.frame:hover {
  box-shadow: var(--sh-lg);
  transform: translateY(-2px);
}

.frame__bar {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding-inline: 12px;
  background: #f7f5f1;
  border-bottom: 1px solid var(--c-line);
}

.frame__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-line-strong);
}

.frame__dot:nth-child(1) {
  background: #e3c3a6;
}

.frame__dot:nth-child(2) {
  background: #d9d5cb;
}

.frame__dot:nth-child(3) {
  background: #d9d5cb;
}

.frame__url {
  margin-left: 8px;
  font-size: 11px;
  color: var(--c-ink-3);
  letter-spacing: 0.02em;
}

.frame img {
  width: 100%;
  display: block;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: top left;
}

.frame__zoom {
  position: absolute;
  right: 12px;
  bottom: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--r-pill);
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid var(--c-line);
  box-shadow: var(--sh-xs);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--c-ink-2);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--dur-1) var(--ease), transform var(--dur-1) var(--ease);
}

.frame:hover .frame__zoom,
.frame:focus-visible .frame__zoom {
  opacity: 1;
  transform: translateY(0);
}

.frame__zoom svg {
  width: 13px;
  height: 13px;
}

/* ------------------------------------------------------------
   灯箱
   ------------------------------------------------------------ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: var(--z-lightbox);
  display: none;
  place-items: center;
  padding: clamp(16px, 4vw, 48px);
  background: rgba(28, 31, 27, 0.82);
}

.lightbox.is-open {
  display: grid;
}

.lightbox__figure {
  max-width: min(1280px, 100%);
  max-height: 100%;
  overflow: auto;
  background: var(--c-surface);
  border-radius: var(--r-md);
  box-shadow: var(--sh-lg);
}

.lightbox__figure img {
  width: 100%;
  height: auto;
}

.lightbox__close {
  position: absolute;
  top: clamp(12px, 2vw, 24px);
  right: clamp(12px, 2vw, 24px);
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.24);
}

.lightbox__close:hover {
  background: rgba(255, 255, 255, 0.24);
}

.lightbox__close svg {
  width: 20px;
  height: 20px;
}

.lightbox__caption {
  padding: 10px 16px;
  font-size: var(--fs-xs);
  color: var(--c-ink-3);
  border-top: 1px solid var(--c-line);
  background: var(--c-surface);
}

/* ------------------------------------------------------------
   页脚
   ------------------------------------------------------------ */
.site-foot {
  background: var(--c-ink);
  color: rgba(255, 255, 255, 0.72);
  padding-top: clamp(var(--sp-8), 6vw, var(--sp-10));
}

.site-foot__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: var(--sp-7) var(--sp-6);
}

.site-foot__brand .brand {
  color: #fff;
  margin-bottom: var(--sp-3);
}

.site-foot__brand img {
  width: 32px;
  height: 32px;
  border-radius: 9px;
}

.site-foot__desc {
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
  max-width: 260px;
}

.site-foot__title {
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.45);
  margin-bottom: var(--sp-3);
}

.site-foot__list {
  display: grid;
  gap: 10px;
}

.site-foot__list a {
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.76);
  transition: color var(--dur-1) var(--ease);
}

.site-foot__list a:hover {
  color: #fff;
}

.site-foot__bottom {
  margin-top: clamp(var(--sp-7), 5vw, var(--sp-9));
  padding-block: var(--sp-5);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.5);
}

.site-foot__legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
}

.site-foot__legal a:hover {
  color: #fff;
}

.site-foot__icp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ------------------------------------------------------------
   通用小件
   ------------------------------------------------------------ */
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 6px 12px 6px 8px;
  border-radius: var(--r-pill);
  background: var(--c-brand-tint);
  border: 1px solid #f3e2ce;
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--c-brand-ink);
}

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

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  font-size: var(--fs-xs);
  font-weight: 600;
  background: var(--c-green-tint);
  color: var(--c-green-deep);
}

/* 滚动淡入（尊重减少动态效果） */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur-3) var(--ease), transform var(--dur-3) var(--ease);
  will-change: opacity, transform;
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

.no-js .reveal {
  opacity: 1;
  transform: none;
}

/* ------------------------------------------------------------
   响应式
   ------------------------------------------------------------ */
@media (max-width: 900px) {
  .site-nav__links {
    display: none;
  }

  .site-nav__actions .btn--ghost {
    display: none;
  }

  .nav-burger {
    display: grid;
  }

  .site-nav__inner {
    gap: var(--sp-3);
  }

  .site-foot__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-6) var(--sp-5);
  }

  .site-foot__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .site-nav__actions .btn--primary {
    min-height: 38px;
    padding: 0 14px;
    font-size: var(--fs-xs);
  }

  .site-foot__grid {
    grid-template-columns: 1fr;
  }
}