/* Mobile Navigation Styles
 * 展开页 = "精密刻度尺"导航(precision scale v2):
 *   横向可拖拽、动量惯性、吸附卡位、无限循环的纯文字刻度尺(更扁),
 *   点击"文章/更多"这类一级项时,面板下方弹出二级子窗口。
 * 原来的竖排长列表在手机端隐藏(桌面端不受影响)。
 */

/* 手机端顶栏:语言国旗 + 搜索按钮(两者都在汉堡左侧) */
.lang-toggle-mobile,
.search-toggle.search-toggle-mobile {
  display: none;
}

@media (max-width: 768px) {
  .lang-toggle-mobile {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: auto; /* 顶栏右侧:国旗 -> 搜索 -> 汉堡 */
    font-size: 15px;
    line-height: 1;
    text-decoration: none;
    cursor: pointer;
    transition: transform 0.15s ease;
  }

  .lang-toggle-mobile:active {
    transform: scale(0.85);
  }

  .search-toggle.search-toggle-mobile {
    display: flex;
    margin-left: 10px; /* 紧挨放大镜右侧的汉堡 */
  }

  .nav-toggle {
    margin-left: 10px; /* 放大镜要离汉堡近一点 */
  }

  .nav-menu .search-toggle {
    display: none; /* 搜索按钮已挪到顶栏 */
  }

  /* ---- 展开面板:精密刻度尺(扁) ---- */
  .nav-menu {
    position: absolute;
    top: calc(100% + 6px);
    left: 8px;
    right: 8px;
    display: none;
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.14);
    padding: 0;
    overflow: hidden;
    z-index: 1000;
  }

  .nav-menu.active {
    display: block;
    animation: nav-scale-in 0.28s cubic-bezier(0.34, 1.3, 0.64, 1);
  }

  /* 原竖排列表在手机端隐藏(由刻度尺替代) */
  .nav-menu .nav-item,
  .nav-menu .has-submenu,
  .nav-menu .search-toggle {
    display: none !important;
  }

  .nav-scale-viewport {
    width: 100%;
    height: 64px;
    position: relative;
    overflow: hidden;
    cursor: grab;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
    -webkit-mask-image: linear-gradient(to right, transparent 0, black 7%, black 93%, transparent 100%);
    mask-image: linear-gradient(to right, transparent 0, black 7%, black 93%, transparent 100%);
  }

  .nav-scale-viewport.dragging {
    cursor: grabbing;
  }

  .nav-scale-viewport svg {
    position: absolute;
    left: 50%;
    top: 0;
    height: 64px;
    will-change: transform;
  }

  .ns-item {
    transform-box: fill-box;
    transform-origin: center;
    will-change: transform, opacity, filter;
  }

  .ns-text {
    fill: var(--accent-color); /* 跟随调色盘主题色,避免写死颜色与主题不一致 */
    font-size: 18px;
    font-weight: 600;
    text-anchor: middle;
    dominant-baseline: middle;
    pointer-events: none;
  }

  /* ---- 二级子窗口:点击"文章/更多"后弹出 ---- */
  .nav-scale-sub {
    display: none;
    flex-wrap: wrap;
    gap: 8px;
    padding: 10px 12px;
    border-top: 1px solid var(--border-color);
  }

  .nav-scale-sub.show {
    display: flex;
    animation: nav-sub-in 0.22s ease;
  }

  .nav-scale-sub a {
    padding: 5px 14px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    font-size: 12px;
    color: var(--text-color);
    text-decoration: none;
    transition: all var(--transition-fast);
  }

  .nav-scale-sub a:hover,
  .nav-scale-sub a.active {
    color: #fff;
    background: var(--accent-color);
    border-color: var(--accent-color);
  }
}

@keyframes nav-scale-in {
  from {
    opacity: 0;
    transform: translateY(-10px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes nav-sub-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}