/**
 * Header — 页眉样式
 *
 * 色彩方案通过 [data-scheme] 属性选择器控制：
 *   [data-scheme="light"] → 亮色参数组
 *   [data-scheme="dark"]  → 暗色参数组
 */

/* ── Base Header ────────────────────────── */
.site-header {
  position: relative;
  width: 100%;
  z-index: var(--en-z-header);
  height: var(--en-header-h);
  flex-shrink: 0;
  transition: background-color var(--en-t-normal),
              height var(--en-t-normal),
              box-shadow var(--en-t-normal),
              border var(--en-t-normal),
              transform var(--en-t-normal);
  padding-left: var(--en-page-pad, 30px);
  padding-right: var(--en-page-pad, 30px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--en-container-max); /* 跟随全局最大宽度 */
  margin: 0 auto;
  padding-left: 0;
  padding-right: 0;
}

/* ══════════════════════════════════════════
   COLOR SCHEME — [data-scheme]
   ══════════════════════════════════════════ */

/* ── Light Scheme ─────────────────────── */
[data-scheme="light"].site-header {
  background-color: var(--en-header-light-bg);
}

[data-scheme="light"] .site-nav .menu li a {
  color: var(--en-nav-color-light);
}

[data-scheme="light"] .site-nav .menu li a:hover,
[data-scheme="light"] .site-nav .menu li.current-menu-item > a {
  color: var(--en-nav-hover-light);
}

[data-scheme="light"] .logo-img-dark  { display: block; }
[data-scheme="light"] .logo-img-light { display: none;  }

[data-scheme="light"] .site-title-text,
[data-scheme="light"] .header-search-btn {
  color: var(--en-nav-color-light);
}

[data-scheme="light"] .hamburger-line {
  color: #111111; /* 亮模式固定为黑线，类似根字体 */
}

[data-scheme="light"].has-border {
  border-bottom: var(--en-header-light-border-w) solid var(--en-header-light-border-color);
}

/* ── Dark Scheme ──────────────────────── */
[data-scheme="dark"].site-header {
  background-color: var(--en-header-dark-bg);
}

[data-scheme="dark"] .site-nav .menu li a {
  color: var(--en-nav-color-dark);
}

[data-scheme="dark"] .site-nav .menu li a:hover,
[data-scheme="dark"] .site-nav .menu li.current-menu-item > a {
  color: var(--en-nav-hover-dark);
}

[data-scheme="dark"] .logo-img-dark  { display: none;  }
[data-scheme="dark"] .logo-img-light { display: block; }

[data-scheme="dark"] .site-title-text,
[data-scheme="dark"] .header-search-btn {
  color: var(--en-nav-color-dark);
}

[data-scheme="dark"] .hamburger-line {
  color: #ffffff; /* 暗模式固定为白线，类似根字体 */
}

[data-scheme="dark"].has-border {
  border-bottom: var(--en-header-dark-border-w) solid var(--en-header-dark-border-color);
}

/* ══════════════════════════════════════════
   TRANSPARENT AUTO MODE
   ══════════════════════════════════════════ */
.site-header.transparent-header {
  position: absolute;
  background-color: transparent !important;
  border-bottom: none !important;
  box-shadow: none !important;
}

/* JS 动态添加的 scheme class（透明自动模式） */
.header-scheme-light .logo-img-dark  { display: block !important; }
.header-scheme-light .logo-img-light { display: none !important;  }
.header-scheme-light .site-nav .menu li a { color: var(--en-nav-color-light); }
.header-scheme-light .site-title-text,
.header-scheme-light .header-search-btn { color: var(--en-nav-color-light); }
.header-scheme-light .hamburger-line { color: #111111; }

.header-scheme-dark .logo-img-dark  { display: none !important;  }
.header-scheme-dark .logo-img-light { display: block !important; }
.header-scheme-dark .site-nav .menu li a { color: var(--en-nav-color-dark); }
.header-scheme-dark .site-title-text,
.header-scheme-dark .header-search-btn { color: var(--en-nav-color-dark); }
.header-scheme-dark .hamburger-line { color: #ffffff; }

/* ══════════════════════════════════════════
   LOGO — 由页眉高度约束
   ══════════════════════════════════════════ */
.site-logo {
  height: 100%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  padding-top: var(--en-logo-pt);
  padding-right: var(--en-logo-pr);
  padding-bottom: var(--en-logo-pb);
  padding-left: var(--en-logo-pl);
}

.logo-link {
  display: flex;
  align-items: center;
  height: 100%;
  text-decoration: none;
}

.logo-images {
  display: flex;
  align-items: center;
  height: 100%;
}

.logo-img {
  height: 100%;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  display: none; /* 默认全隐藏，由 [data-scheme] 控制显示 */
}

.site-title-text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* ══════════════════════════════════════════
   NAVIGATION
   ══════════════════════════════════════════ */
.site-nav {
  display: flex;
  align-items: center;
}

.site-nav .menu {
  display: flex;
  align-items: center;
  gap: var(--en-nav-item-gap);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav .menu li a {
  font-size: var(--en-nav-font-size);
  font-weight: var(--en-nav-font-weight);
  letter-spacing: var(--en-nav-letter-space);
  text-transform: var(--en-nav-transform);
  transition: color var(--en-t-fast);
  position: relative;
  text-decoration: none;
  display: inline-block;
  padding: 4px 0;
  white-space: nowrap; /* 强制不换行，避免 ABOUT US 被压缩成两行 */
}

/* 下划线动效 */
.site-nav .menu li a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: var(--en-nav-u-offset);
  width: 100%;
  height: var(--en-nav-u-h);
  background-color: currentColor;
  transform: scaleX(0);
  transform-origin: var(--underline-origin, left center);
  transition: transform 0.4s cubic-bezier(0.19, 1, 0.22, 1);
  opacity: var(--en-nav-u-show);
}

.site-nav .menu li a:hover::after {
  transform: scaleX(1);
}

/* ══════════════════════════════════════════
   SEARCH BUTTON
   ══════════════════════════════════════════ */
.header-search-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  color: inherit;
  background: transparent;
  border: none;
  cursor: pointer;
  margin-left: var(--en-header-search-gap);
  transition: color var(--en-t-fast);
}

.header-search-btn svg {
  width: 100%;
  height: 100%;
}

/* ══════════════════════════════════════════
   HAMBURGER MENU TOGGLE
   ══════════════════════════════════════════ */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: var(--en-hamburger-size);
  height: calc(var(--en-hamburger-size) * 0.7);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: calc(var(--en-z-overlay) + 10);
}

.hamburger-line {
  display: block;
  width: 100%;
  height: var(--en-icon-stroke);
  background-color: currentColor;
  transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease;
  transform-origin: center;
}

/* 汉堡变叉动画 */
body.menu-is-open .menu-toggle .top-line {
  transform: translateY(calc(var(--en-hamburger-size) * 0.35 - var(--en-icon-stroke) * 0.5)) rotate(45deg);
}
body.menu-is-open .menu-toggle .middle-line {
  opacity: 0;
}
body.menu-is-open .menu-toggle .bottom-line {
  transform: translateY(calc(var(--en-hamburger-size) * -0.35 + var(--en-icon-stroke) * 0.5)) rotate(-45deg);
}

/* ══════════════════════════════════════════
   STICKY STATE
   ══════════════════════════════════════════ */
.site-header.sticky-enabled:not(.transparent-header) {
  position: sticky;
  top: 0;
  z-index: var(--en-z-floating);
}

.site-header.is-sticky {
  height: var(--en-header-h-sticky);
  backdrop-filter: var(--en-sticky-blur, none);
  -webkit-backdrop-filter: var(--en-sticky-blur, none);
}

/* Smart hide 动画 */
.site-header.is-hidden {
  transform: translateY(-100%);
}

.site-header.is-visible {
  transform: translateY(0);
}

/* ══════════════════════════════════════════
   MOBILE
   ══════════════════════════════════════════ */
@media (max-width: 778px) {
  .site-header {
    height: var(--en-header-h-mobile);
    padding-left: var(--en-page-pad-mobile, 15px);
    padding-right: var(--en-page-pad-mobile, 15px);
  }



  .menu-toggle {
    display: flex;
  }

  .menu-toggle {
    position: relative;
  }

  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--en-color-bg);
    z-index: var(--en-z-overlay);
    padding: calc(var(--en-header-h-mobile) + 20px) var(--en-page-pad-mobile, 15px) calc(var(--en-header-h-mobile) + 100px);

    display: flex;
    flex-direction: column;
    align-items: var(--en-nav-mobile-align, flex-start);
    text-align: var(--en-nav-mobile-text-align, left);

    visibility: hidden;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.4s ease, transform 0.4s ease, visibility 0.4s;
  }

  body.menu-is-open .site-nav {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
  }

  /* 移动端菜单色彩跟随全站色彩方案 */
  body.menu-is-open .site-nav .menu li a {
    color: var(--en-color-text);
  }

  body.menu-is-open .menu-toggle .hamburger-line {
    color: var(--en-color-text);
    background-color: var(--en-color-text);
  }

  .site-nav .menu {
    flex-direction: column;
    align-items: var(--en-nav-mobile-align, flex-start);
    text-align: var(--en-nav-mobile-text-align, left);
    gap: 0;
    width: 100vw; /* 强制全宽以实现网格边框通栏 */
    margin-left: calc(-1 * var(--en-page-pad-mobile, 15px)); /* 抵消父级 padding */
    margin-top: auto;
    margin-bottom: auto;
  }

  .site-nav.is-gridlines .menu {
    border-top: 1px solid var(--en-color-text);
  }

  .site-nav .menu li {
    width: 100%;
    display: flex;
    justify-content: var(--en-nav-mobile-align, flex-start);
    align-items: center;
    min-height: var(--en-nav-mobile-row-h, 60px);
    padding: 0 var(--en-page-pad-mobile, 15px); /* 把文字拉回到正常的 padding 内 */
  }

  .site-nav.is-gridlines .menu li {
    border-bottom: 1px solid var(--en-color-text);
  }

  .site-nav .menu li a {
    font-size: 28px;
    font-weight: 500;
    padding: 0;
  }

  .site-nav .menu li a::after {
    display: none; /* 移动端全屏菜单关闭划线 */
  }

  .header-search-btn {
    position: absolute;
    bottom: 40px;
    margin-top: 0;
    margin-left: 0;
    width: 24px;
    height: 24px;
    align-self: var(--en-nav-mobile-align, flex-start);
  }
}

/* ══════════════════════════════════════════
   SEARCH MODAL
   ══════════════════════════════════════════ */
.search-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.search-modal.is-open {
  opacity: 1;
  visibility: visible;
}

.search-modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--en-color-bg);
  backdrop-filter: blur(10px);
  opacity: 0.98;
}

.search-modal-content {
  position: relative;
  width: 100%;
  max-width: 800px;
  padding: 0 var(--en-page-pad, 40px);
  z-index: 2;
  transform: translateY(30px);
  transition: transform 0.4s ease;
}

.search-modal.is-open .search-modal-content {
  transform: translateY(0);
}

.search-modal-close {
  position: absolute;
  top: -80px;
  right: var(--en-page-pad, 40px);
  background: none;
  border: none;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-modal-close span {
  position: absolute;
  width: 30px;
  height: 1px;
  background: var(--en-color-text);
  transition: transform 0.3s ease;
}

.search-modal-close span:first-child { transform: rotate(45deg); }
.search-modal-close span:last-child { transform: rotate(-45deg); }

.search-modal-close:hover span {
  transform: rotate(0);
}

.search-form-wrapper {
  width: 100%;
}

.search-form {
  position: relative;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--en-color-text);
  gap: 15px;
}

.search-field {
  flex: 1;
  background: none;
  border: none;
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 400;
  padding: 10px 0 6px;
  outline: none;
  color: var(--en-color-text);
  font-family: inherit;
}

.search-field::placeholder {
  color: var(--en-color-muted);
}

.search-submit {
  background: var(--en-color-text);
  border: none;
  cursor: pointer;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: var(--en-color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.3s ease, transform 0.3s ease;
  margin-bottom: 6px;
  flex-shrink: 0;
}

.search-submit:hover {
  opacity: 0.7;
  transform: translateX(3px);
}

.search-submit svg {
  width: 20px;
  height: 20px;
}